I know this sounds feddy, but bonus if they’re improvised, cos that shits awesome.
One of my favourites is the PRIG - an IRA made grenade launcher that used a packet of biscuits to offset and quieten the backblast.
I also made a crossbow that fired nuts and bolts using wood and resistance bands. Not a weapon of war and would never be lethal, but also probably not very legal where I’m from. I just used it to plink cans in the back garden when I was bored. Was actually quite a scarily powerful and accurate device for how crude it was.
Having shot the AR-15 a couple of times I can see why it was the standard issue for the military. Light easy to use and operate and very accurate.
Siege towers
Sappers in general, digging under walls to collapse them and shit like that.
Big fan of bows, and the longer the better. I know it’s not a unique choice but what can I say they’re a classic for a reason.
the ditch
